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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/graphics.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/global.hpp>
#include <mapnik/color.hpp>
// agg
#include "agg_rendering_buffer.h"
#include "agg_pixfmt_rgba.h"
// cairo
#ifdef HAVE_CAIRO
#include <cairomm/surface.h>
#endif
// boost
#include <boost/scoped_array.hpp>
// stl
#include <iostream>
namespace mapnik
{
image_32::image_32(int width,int height)
:width_(width),
height_(height),
data_(width,height),
painted_(false) {}
image_32::image_32(const image_32& rhs)
:width_(rhs.width_),
height_(rhs.height_),
data_(rhs.data_),
painted_(rhs.painted_) {}
#ifdef HAVE_CAIRO
image_32::image_32(Cairo::RefPtr<Cairo::ImageSurface> rhs)
:width_(rhs->get_width()),
height_(rhs->get_height()),
data_(rhs->get_width(),rhs->get_height())
{
painted_ = true;
if (rhs->get_format() != Cairo::FORMAT_ARGB32)
{
MAPNIK_LOG_WARN(graphics) << "Unable to convert this Cairo format";
return; // throw exception ??
}
int stride = rhs->get_stride() / 4;
boost::scoped_array<unsigned int> out_row(new unsigned int[width_]);
const unsigned int *in_row = (const unsigned int *)rhs->get_data();
for (unsigned int row = 0; row < height_; row++, in_row += stride)
{
for (unsigned int column = 0; column < width_; column++)
{
unsigned int in = in_row[column];
unsigned int a = (in >> 24) & 0xff;
unsigned int r = (in >> 16) & 0xff;
unsigned int g = (in >> 8) & 0xff;
unsigned int b = (in >> 0) & 0xff;
#define DE_ALPHA(x) do { \
if (a == 0) x = 0; \
else x = x * 255 / a; \
if (x > 255) x = 255; \
} while(0)
DE_ALPHA(r);
DE_ALPHA(g);
DE_ALPHA(b);
out_row[column] = color(r, g, b, a).rgba();
}
data_.setRow(row, out_row.get(), width_);
}
}
#endif
image_32::~image_32() {}
void image_32::set_grayscale_to_alpha()
{
for (unsigned int y = 0; y < height_; ++y)
{
unsigned int* row_from = data_.getRow(y);
for (unsigned int x = 0; x < width_; ++x)
{
unsigned rgba = row_from[x];
// TODO - big endian support
unsigned r = rgba & 0xff;
unsigned g = (rgba >> 8 ) & 0xff;
unsigned b = (rgba >> 16) & 0xff;
// magic numbers for grayscale
unsigned a = (int)((r * .3) + (g * .59) + (b * .11));
row_from[x] = (a << 24)| (255 << 16) | (255 << 8) | (255) ;
}
}
}
void image_32::set_color_to_alpha(const color& c)
{
for (unsigned y = 0; y < height_; ++y)
{
unsigned int* row_from = data_.getRow(y);
for (unsigned x = 0; x < width_; ++x)
{
unsigned rgba = row_from[x];
unsigned r = rgba & 0xff;
unsigned g = (rgba >> 8 ) & 0xff;
unsigned b = (rgba >> 16) & 0xff;
if (r == c.red() && g == c.green() && b == c.blue())
{
row_from[x] = 0;
}
}
}
}
void image_32::set_alpha(float opacity)
{
{
for (unsigned int y = 0; y < height_; ++y)
{
unsigned int* row_to = data_.getRow(y);
for (unsigned int x = 0; x < width_; ++x)
{
unsigned rgba = row_to[x];
#ifdef MAPNIK_BIG_ENDIAN
unsigned a0 = (rgba & 0xff);
unsigned a1 = int( (rgba & 0xff) * opacity );
if (a0 == a1) continue;
unsigned r = (rgba >> 24) & 0xff;
unsigned g = (rgba >> 16 ) & 0xff;
unsigned b = (rgba >> 8) & 0xff;
row_to[x] = (a1) | (b << 8) | (g << 16) | (r << 24) ;
#else
unsigned a0 = (rgba >> 24) & 0xff;
unsigned a1 = int( ((rgba >> 24) & 0xff) * opacity );
//unsigned a1 = opacity;
if (a0 == a1) continue;
unsigned r = rgba & 0xff;
unsigned g = (rgba >> 8 ) & 0xff;
unsigned b = (rgba >> 16) & 0xff;
row_to[x] = (a1 << 24)| (b << 16) | (g << 8) | (r) ;
#endif
}
}
}
}
void image_32::set_background(const color& c)
{
background_=c;
data_.set(background_->rgba());
}
boost::optional<color> const& image_32::get_background() const
{
return background_;
}
void image_32::premultiply()
{
agg::rendering_buffer buffer(data_.getBytes(),width_,height_,width_ * 4);
agg::pixfmt_rgba32 pixf(buffer);
pixf.premultiply();
}
void image_32::demultiply()
{
agg::rendering_buffer buffer(data_.getBytes(),width_,height_,width_ * 4);
agg::pixfmt_rgba32 pixf(buffer);
pixf.demultiply();
}
void image_32::composite_pixel(unsigned op, int x,int y, unsigned c, unsigned cover, double opacity)
{
typedef agg::rgba8 color_type;
typedef color_type::value_type value_type;
typedef agg::order_rgba order_type;
typedef agg::comp_op_adaptor_rgba<color_type,order_type> blender_type;
if (checkBounds(x,y))
{
unsigned rgba = data_(x,y);
unsigned ca = (unsigned)(((c >> 24) & 0xff) * opacity);
unsigned cb = (c >> 16 ) & 0xff;
unsigned cg = (c >> 8) & 0xff;
unsigned cr = (c & 0xff);
blender_type::blend_pix(op, (value_type*)&rgba, cr, cg, cb, ca, cover);
data_(x,y) = rgba;
}
}
}
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